<template>
  <div>
    <!-- Header 区域 -->
    <van-nav-bar
      fixed
      title="文章详情"
      left-arrow
      @click-left="$router.back()"
    />

    <!-- 文章内容出现之前加载 -->
    <van-loading color="#0094ff" vertical class="article_loading" v-if="artObj.title === undefined"  >
      加载中
    </van-loading>
    <!-- 文章内容和评论列表 -->
    <div v-else>
      <!-- 文章信息区域 -->
    <div class="article-container"  >
      <!-- 文章标题 -->
      <h1 class="art-title">{{ artObj.title }}</h1>

      <!-- 用户信息 -->
      <van-cell
        center
        :title="artObj.aut_name"
        :label="formData(artObj.pubdate)"
      >
        <template #icon>
          <img :src="artObj.aut_photo" alt="" class="avatar" />
        </template>
        <template #default>
          <div>
            <van-button
              type="info"
              size="mini"
              v-if="artObj.is_followed === true"
              @click="unShowFollowedFn"
              >已关注</van-button
            >
            <van-button
              icon="plus"
              type="info"
              size="mini"
              plain
              v-else
              @click="ShowFollowedFn"
              >关注</van-button
            >
          </div>
        </template>
      </van-cell>

      <!-- 分割线 -->
      <van-divider></van-divider>

      <!-- 文章内容 -->
      <div class="art-content"  v-html="artObj.content"></div>

      <!-- 分割线 -->
      <van-divider>End</van-divider>

      <!-- 点赞 -->
      <div class="like-box">
        <van-button
          icon="good-job"
          type="danger"
          size="small"
          v-if="artObj.attitude >= 0"
          @click="unLikeArticleFn"
          >已点赞</van-button
        >
        <van-button
          icon="good-job-o"
          type="danger"
          plain
          size="small"
          v-else
          @click="likeArticleFn"
          >点赞</van-button
        >
      </div>
    </div>

    <!-- 评论列表 -->
    <comment-list
      :artId="$route.query.aId"
      @toFirstCommentEvent="toFirstCommentFn"
    ></comment-list>
    </div>
  </div>
</template>

<script>
import dayjs from 'dayjs'
import * as relativeTime from 'dayjs/plugin/relativeTime' // import plugin
import 'dayjs/locale/zh-cn' // use locale

import {
  getArticleDetailAPI,
  followedAuthorAPI,
  unFollowedAuthorAPI,
  likeArticleAPI,
  unLikeArticleAPI
} from '@/api'
import commentList from './commentList.vue'

dayjs.extend(relativeTime) // use plugin
dayjs.locale('zh-cn')
export default {
  name: 'Article',
  components: { commentList },
  data () {
    return {
      artObj: {}
    }
  },
  async created () {
    const res = await getArticleDetailAPI(this.$route.query.aId)
    this.artObj = res.data.data
  },
  methods: {
    formData (oldDate) {
      var a = dayjs()
      var b = dayjs(oldDate)
      const c = a.to(b) // in 2 years
      return c
    },
    // 关注按钮，点击事件
    async ShowFollowedFn () {
      await followedAuthorAPI(this.artObj.aut_id)
      this.artObj.is_followed = true
    },
    // 点击已关注按钮  点击事件
    async unShowFollowedFn () {
      await unFollowedAuthorAPI(this.artObj.aut_id)
      this.artObj.is_followed = false
    },
    async unLikeArticleFn () {
      await unLikeArticleAPI(this.artObj.art_id)
      this.artObj.attitude = -1
    },
    async likeArticleFn () {
      await likeArticleAPI(this.artObj.art_id)
      this.artObj.attitude = 1
    },
    toFirstCommentFn () {
      document.querySelector('.like-box').scrollIntoView({
        behavior: 'smooth'
      })
    }
  }
}
</script>

<style scoped lang="less">
.article_loading{
   margin-top:250px;
}
.article-container {
  padding: 10px;
  margin-top: 46px;
}
.art-title {
  font-size: 16px;
  font-weight: bold;
  margin: 10px 0;
}

.art-content {
  font-size: 12px;
  line-height: 24px;
  width: 100%;
  overflow-x: scroll;
  word-break: break-all;
  /deep/ img {
    width: 100%;
  }
  /deep/ pre {
    white-space: pre-wrap;
    word-wrap: break-word;
  }
}

.van-cell {
  padding: 5px 0;
  &::after {
    display: none;
  }
}

.avatar {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background-color: #f8f8f8;
  margin-right: 5px;
  border: none;
}

.like-box {
  display: flex;
  justify-content: center;
}
/deep/ .van-icon-arrow-left {
  color: white;
}
</style>
